TASK 2: Precipitation and cloud assimilation
ATR: Arthur Hou
Period of Performance: January 1, 2011 – September 30, 2011
Statement of Work
DESCRIPTION OF WORK TO BE PERFORMED:
(a) Continue the development of the WRF based Ensemble Data assimilation System to support the GPM Mission scientific applications.
- Develop and refine the ensemble data assimilation techniques for dynamic downscaling satellite precipitation observations at cloud-resolving scales.
- Verify and validate the performance of the WRF Ensemble Data Assimilation System.
- Perform assimilation experiments to investigate precipitation data impact on analyses and forecasts.
- Provide software/algorithm documents and scientific research reports
(b) Explore innovative methods to create a comprehensive global precipitation dataset from multiple data sources, in multiple temporal and spatial scales.
- Carry out preliminary studies on different approaches of optimal interpolation, Bayesian inversion, maximum likelihood estimation, and dynamic merging of observations.
- Begin the development of a prototype system to test and evaluate the effectiveness of the approach and accuracy of the precipitation analysis.
- Provide software/algorithm documents and scientific research reports
(c) Keep up with the development of assimilating satellite-observed precipitation using the model as a weak-constraint.
- Stay abreast with the development of the Goddard GDAS and contribute to the development and evaluation of precipitation assimilation component in the GDAS as appropriate.
TASK DOCUMENTATION REQUIREMENTS/DELIVERABLE ITEMS:
(a) A WRF ensemble data assimilation system for precipitation assimilation together with data impact evaluation and documentation.
(b) A prototype optimal data-merging algorithm and system for a global precipitation analysis from multiple data sources.
PERFORMANCE/MILESTONE SCHEDULE:
(a) 50% completion in the first 6 months in the contract year.
(b) 100% completion by the end of the contract year
(c) 100% completion by the end of the contract year.
QUALITY ASSURANCE REQUIREMENTS:
TECHNICAL:
Minimum: 90% of deliverable items are completed technically correct, and reports are submitted in clear concise formats.
Target: 95% of deliverable items are completed technically correct, and reports are submitted in clear concise formats.
Maximum: 100% of deliverable items are completed technically correct, and reports are submitted in clear concise formats.
SCHEDULE:
Minimum: Meets technical target for deliverables within 1 week of expected completion 75% of the time.
Target: Meets technical target for deliverables within 3 days of expected completion 90% of the time.
Maximum: Meets technical target for deliverables within expected completion date 100% of the time.
COST:
Minimum: Cost overruns are no more than 5% of the estimate cost.
Target: Meets target cost, target technical and target schedule performance standards described above.
Maximum: Cost under runs are at least 5% of the estimated cost in meeting the target technical and target schedule performance standards described above.
TRAVEL, MATERIALS, ETC., KNOWN TO BE REQUIRED:
One 5-day international or domestic trip to present results at a major conference, and one 4-day domestic trip to attend the PMM Science Team meeting.